Changes in subdomains of non-organized physical activity between childhood and adolescence in Australia: a longitudinal study

Table 2 Characteristics of the sample with valid TUD data in each wave, unweighted LSAC data

	Wave 6 10-11y, 2014 (n = 3455) ^a	Wave 7 12-13y, 2016 (n = 2971) ^b
Males, n (%)	1756 (50.8%)	1514 (51.0%)^c
Age, mean (SD)	10.4 (0.5)^d	12.4 (0.5)^d
Family socioeconomic position index, mean (SD) ^e	0.0 (1.0)	0.0 (1.0)
Speaks language other than English at home, n (%)	291 (8.4%)	262 (8.8%)^c
Aboriginal or Torres Strait Islander, n (%)	92 (2.7%)	67 (2.3%)^c
Lives in regional or remote area, n (%)	1251 (36.2%)	1077 (36.3%)^c
Attended school on day of TUD, n (%)	1683 (48.7%)	1548 (52.1%)
Season of measurement, n (%)
Summer	69 (2.0%)	256 (8.6%)
Autumn	846 (24.5%)	439 (14.8%)
Winter	1373 (39.8%)	1626 (54.8%)
Spring	1162 (33.7%)	649 (21.9%)

LSAC Longitudinal Study of Australian Children, n number of participants, % proportion of sample, SD standard deviation, TUD time use diary. Percentages may add to more than 100% due to rounding
^aVariable-specific missing data for Wave 6: socioeconomic position index (n = 29), season of measurement (n = 5), main language spoken at home (n = 1)
^bVariable-specific missing data for Wave 7: socioeconomic position index (n = 14), season of measurement (n = 1)
^cWeighted proportions for Wave 7 (comparison with national Census data [27]): 51.1% were male (Census: 51.4%), 12.5% spoke languages other than English at home (Census: 16.9%), 2.8% were of Aboriginal or Torres Strait Islander origin (Census: 5.1%) and 33.2% lived in regional or remote areas (Census: 30.4%)
^dOf the participants with valid data in both waves, the average time between waves was 24.5 months (SD=3.0, n = 2812)
^eThe socioeconomic position index was z-scored and ranged from -5.5 to 2.7 in Wave 6 and from -7.4 to 2.7 in Wave 7

ISSN: 1479-5868